- limits conflict errors (the list is automaticaly modified, though rarely)
 - allows to store key, value pairs
Cache processingNode computation result.
Add accessors to node btree.
Remove manage_addNode as it's now automaticaly done.
Update iser interface and add new required methods.
Automaticaly register self as an available processing node when process_timer is called.
Use distributing node accessor instead of accessing the value directly.
Empty processing node list and no defined distributing node means now that the feature is disabled, not that every node distributes and process.
Display the ip:port value which identifies current node on the user interface.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@16940 20353a03-c40f-0410-a6d1-a30d3c3de9de